Sync.

vite/src/pipedal/AudioFileMetadata.tsx

@@ -38,13 +38,78 @@ function getVersionSuffix(filePath: string): string | null {
     return match ? match[1] : null;
 }
 
+export function safeFilenameDecode(filename: string): string {
+    let originalFilename = filename;
+    let pos = filename.indexOf('%');
+    if (pos < 0) {
+        return filename;
+    }
+    let result = "";
+    while (true) {
+        if (pos < 0) {
+            result += filename;
+            return result;
+        }
+        result += filename.substring(0, pos);
+        if (pos+3 >= filename.length) {
+            // invalid encoding. just use the original
+            return originalFilename; 
+        }
+        let hex = filename.charAt(pos+1) + filename.charAt(pos+2);
+        let byte = parseInt(hex, 16);
+
+        // Handle UTF-8 to UTF-16 conversion
+        if (byte < 0x80) {
+            // Single-byte character (ASCII)
+            result += String.fromCharCode(byte);
+            filename = filename.substring(pos+3);
+        } else if ((byte & 0xE0) === 0xC0) {
+            // 2-byte sequence
+            if (pos+6 > filename.length || filename.charAt(pos+3) !== '%') {
+                return originalFilename; // invalid encoding
+            }
+            let byte2 = parseInt(filename.charAt(pos+4) + filename.charAt(pos+5), 16);
+            let codePoint = ((byte & 0x1F) << 6) | (byte2 & 0x3F);
+            result += String.fromCharCode(codePoint);
+            filename = filename.substring(pos+6);
+        } else if ((byte & 0xF0) === 0xE0) {
+            // 3-byte sequence
+            if (pos+9 > filename.length || filename.charAt(pos+3) !== '%' || filename.charAt(pos+6) !== '%') {
+                return originalFilename; // invalid encoding
+            }
+            let byte2 = parseInt(filename.charAt(pos+4) + filename.charAt(pos+5), 16);
+            let byte3 = parseInt(filename.charAt(pos+7) + filename.charAt(pos+8), 16);
+            let codePoint = ((byte & 0x0F) << 12) | ((byte2 & 0x3F) << 6) | (byte3 & 0x3F);
+            result += String.fromCharCode(codePoint);
+            filename = filename.substring(pos+9);
+        } else if ((byte & 0xF8) === 0xF0) {
+            // 4-byte sequence (surrogate pair needed)
+            if (pos+12 > filename.length || filename.charAt(pos+3) !== '%' || filename.charAt(pos+6) !== '%' || filename.charAt(pos+9) !== '%') {
+                return originalFilename; // invalid encoding
+            }
+            let byte2 = parseInt(filename.charAt(pos+4) + filename.charAt(pos+5), 16);
+            let byte3 = parseInt(filename.charAt(pos+7) + filename.charAt(pos+8), 16);
+            let byte4 = parseInt(filename.charAt(pos+10) + filename.charAt(pos+11), 16);
+            let codePoint = ((byte & 0x07) << 18) | ((byte2 & 0x3F) << 12) | ((byte3 & 0x3F) << 6) | (byte4 & 0x3F);
+            // Convert to UTF-16 surrogate pair
+            codePoint -= 0x10000;
+            result += String.fromCharCode(0xD800 + (codePoint >> 10));
+            result += String.fromCharCode(0xDC00 + (codePoint & 0x3FF));
+            filename = filename.substring(pos+12);
+        } else {
+            // Invalid UTF-8 start byte
+            return originalFilename;
+        }
+        pos = filename.indexOf('%');
+    }
+}
 
 export function getTrackTitle(pathname: string, metadata: AudioFileMetadata | null | undefined): string {
     if (!metadata) {
-        return pathFileName(pathname);
+        return safeFilenameDecode(pathFileName(pathname));
     }
     if (metadata.title === "") {
-        return pathFileName(pathname);
+        return safeFilenameDecode(pathFileName(pathname));
     }
     let trackDisplay = "";
     if (metadata.track > 0) {
@@ -56,7 +121,7 @@ export function getTrackTitle(pathname: string, metadata: AudioFileMetadata | nu
     }
     let result = trackDisplay + metadata.title;
     if (result === "") {
-        result = pathFileName(pathname);
+        result = safeFilenameDecode(pathFileName(pathname));
     }
     let versionSuffix = getVersionSuffix(pathname);
     if (versionSuffix) {